JP2008527060A5 - - Google Patents

Claims (18)

Functionalized and cross-linked polyvinyl aromatic nanoparticles which can be used in particular as reinforcing fillers in polymer matrices, characterized in that the polyvinyl aromatics are at least the following copolymers:
-Vinyl aromatic comonomer "A",
A comonomer “B” having a functional group represented by Z of the formula ≡Si-X (wherein X represents a hydroxyl or hydrolyzable group),
A crosslinking comonomer “C” which is at least difunctional and can be polymerized by addition reaction, the comonomer C being vinyl aromatic or non-vinyl aromatic, In some cases, it is the same or different vinyl aromatic as comonomer A).   The nanoparticle according to claim 1, wherein X is halogen.   The nanoparticle according to claim 1, wherein X satisfies the formula OR, and R represents hydrogen or a monovalent linear or branched hydrocarbon group. Z is, meets one of the following formulas, according to claim 1, wherein the nanoparticle:

Wherein the group R ¹ is the same or different, substituted or unsubstituted, selected from the group consisting of C ₁ -C ₈ alkyl, C ₅ -C ₈ cycloalkyl and C ₆ -C ₁₂ aryl. That;
The group R ² is the same or different, substituted or unsubstituted, and is selected from the group consisting of hydroxyl, C ₁ -C ₈ alkoxyl and C ₅ -C ₈ cycloalkoxyl). The nanoparticle according to any one of claims 1 to 4 , wherein the main mass fraction of the copolymer is a vinyl aromatic fraction. The nanoparticle according to any one of claims 1 to 5 , wherein the vinyl aromatic comonomer is a styrene comonomer. Comonomer B is hydroxy silyl (C ₁ ~C ₄₎ alkyl acrylates and methacrylates, from (C ₁ ~C ₄₎ alkoxysilyl (C ₁ ~C ₄₎ alkyl acrylates and methacrylates, as well as the group consisting of mixtures of such monomers The nanoparticle according to any one of claims 1 to 6 , which is selected. Comonomer B is styryl (C ₁ ~C ₄₎ alkyl hydroxy silane, styryl (C ₁ ~C ₄₎ alkyl (C ₁ ~C ₄₎ alkoxysilane, and is selected from the group consisting of mixtures of such monomers, wherein Item 8. The nanoparticle according to any one of Items 1 to 7 . The molar content of comonomer B in polyvinyl aromatic is from 5% to 30%, the nanoparticles of claim 1, wherein. The nanoparticle according to any one of claims 1 to 9 , wherein the comonomer C has at least two polymerizable unsaturated groups. The nanoparticle according to any one of claims 1 to 10 , wherein the comonomer C is a styrene compound. The nanoparticle according to any one of claims 1 to 11, wherein a mass content of the comonomer C in the polyvinyl aromatic is 10% to 30%. 13. Nanoparticles according to claim 12 , wherein the polyvinyl aromatic is a copolymer of styrene, ethyl vinyl benzene, divinyl benzene and trimethoxysilylpropyl (meth) acrylate. The nanoparticle according to claim 13 , wherein the mass content of trimethoxysilylpropyl (meth) acrylate is 10 to 30%. The nanoparticle according to any one of claims 1 to 14 , wherein an average diameter of the nanoparticle is 10 to 100 nm. The masterbatch containing the nanoparticle of any one of Claims 1-15 currently embedded in the polymer matrix. The following steps,
-First obtaining a latex of a polymer latex and a filler in the form of nanoparticles,
-Intimately mixing each latex;
-Settling the mixture so obtained; and
-Then washing and drying the precipitate thus obtained,
Wherein the filler comprises polyvinyl aromatic nanoparticles having a functional group represented by Z of the formula ≡Si-X (wherein X represents hydroxyl or a hydrolyzable group). A method for obtaining a masterbatch comprising at least one polymer and a nanoparticulate filler. A polymer composition comprising at least a polymer, the nanoparticles according to any one of claims 1 to 15 , and a coupling agent for bonding between the polymer and the nanoparticles.

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